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Consolidated Statement of Stockholders' Equity Consolidated Statement of Stockholders' Equity - USD ($)
Total
Common Stock
Treasury Stock
Additional Paid-in Capital
Accumulated Other Comprehensive Income (loss)
Retained Earnings
Beginning Balance, shares   51,636,000 15,059,000      
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest $ 724,025,000 $ 52,000 $ (472,536,000) $ 461,494,000 $ (2,941,000) $ 737,956,000
Stock options exercised, shares   314,000        
Stock options exercised, value 8,880,000 $ 0   8,880,000    
Restricted/Performance stock units vested   31,000        
Shares paid for tax withholding, shares   (2,000)        
Shares paid for tax withholding, value (168,000)     (168,000)    
Share-based Compensation Expense       5,332,000    
Share-based Compensation Expense 5,332,000          
Repurchases of common stock, shares   (196,000) (196,000)      
Repurchases of common stock, value (16,490,000)   $ (16,490,000)      
Net income 45,630,000         45,630,000
Cumulative Effect on Retained Earnings, Tax, Adoption of ASU 2016-16 (426,000)          
Cumulative Effect on Retained Earnings, Tax, Adoption of ASU 2016-16 | Adoption of ASU 2016-16           (426,000)
Foreign currency translation adjustment $ (270,000)       (270,000)  
Repurchases of common stock, shares (196,000)          
Repurchases of common stock, value $ (16,490,000)          
Net income 146,609,000          
Unrealized gains (losses) from foreign currency translation adjustments (2,877,000)          
Beginning Balance, shares   51,783,000 15,255,000      
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest 766,513,000 $ 52,000 $ (489,026,000) 475,538,000 (3,211,000) 783,160,000
Stock options exercised, shares   378,000        
Stock options exercised, value 10,891,000 $ 0   10,891,000    
Restricted/Performance stock units vested   8,000        
Share-based Compensation Expense       6,720,000    
Share-based Compensation Expense 6,720,000          
Net income 43,853,000         43,853,000
Foreign currency translation adjustment (2,786,000)       (2,786,000)  
Beginning Balance, shares   52,169,000 15,255,000      
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest 825,191,000 $ 52,000 $ (489,026,000) 493,149,000 (5,997,000) 827,013,000
Stock options exercised, shares   826,000        
Stock options exercised, value 22,259,000 $ 1,000   22,258,000    
Share-based Compensation Expense       7,643,000    
Share-based Compensation Expense $ 7,643,000          
Repurchases of common stock, shares 0          
Repurchases of common stock, value $ 0          
Net income 57,126,000         57,126,000
Unrealized gains (losses) from foreign currency translation adjustments 179,000          
Foreign currency translation adjustment 179,000       179,000  
Beginning Balance, shares   52,995,000 15,255,000      
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest 912,398,000 $ 53,000 $ (489,026,000) 523,050,000 (5,818,000) 884,139,000
Beginning Balance, shares   53,085,000 15,255,000      
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest 969,065,000 $ 53,000 $ (489,026,000) 533,164,000 (6,199,000) 931,073,000
Stock options exercised, shares   224,000        
Stock options exercised, value 6,867,000 $ 0   6,867,000    
Restricted/Performance stock units vested   29,000        
Shares paid for tax withholding, shares   (1,000)        
Shares paid for tax withholding, value (123,000)     (123,000)    
Share-based Compensation Expense       7,317,000    
Share-based Compensation Expense 7,317,000          
Cumulative Effect on Retained Earnings, Tax, Adoption of ASU 2016-02 | Cumulative effect of adoption of ASU 2016-02 (26,795,000)         (26,795,000)
Net income 49,322,000          
Unrealized gains (losses) from foreign currency translation adjustments         (577,000)  
Foreign currency translation adjustment $ (577,000)          
Stock options exercised, shares 699,000          
Repurchases of common stock, shares (208,000)          
Repurchases of common stock, value $ (27,924,000)          
Net income 143,295,000          
Unrealized gains (losses) from foreign currency translation adjustments (1,595,000)       (1,595,000)  
Beginning Balance, shares   53,337,000 15,255,000      
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest 1,005,076,000 $ 53,000 $ (489,026,000) 547,225,000 (6,776,000) 953,600,000
Stock options exercised, shares   189,000        
Stock options exercised, value 5,999,000 $ 0   5,999,000    
Restricted/Performance stock units vested   7,000        
Share-based Compensation Expense       11,473,000    
Share-based Compensation Expense 11,473,000          
Repurchases of common stock, shares   (208,000) (208,000)      
Repurchases of common stock, value (27,854,000)   $ (27,854,000)      
Net income 44,888,000          
Unrealized gains (losses) from foreign currency translation adjustments         292,000  
Foreign currency translation adjustment 292,000          
Beginning Balance, shares   53,325,000 15,463,000      
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest 1,039,874,000 $ 53,000 $ (516,880,000) 564,697,000 (6,484,000) 998,488,000
Stock options exercised, shares   286,000        
Stock options exercised, value 9,925,000 $ 1,000   9,924,000    
Share-based Compensation Expense       10,855,000    
Share-based Compensation Expense $ 10,855,000          
Repurchases of common stock, shares (1,000) 0 0      
Repurchases of common stock, value $ (70,000)   $ (70,000)      
Net income 49,085,000          
Unrealized gains (losses) from foreign currency translation adjustments (1,310,000)       (1,310,000)  
Foreign currency translation adjustment (1,310,000)          
Beginning Balance, shares   53,611,000 15,463,000      
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest $ 1,108,359,000 $ 54,000 $ (516,950,000) $ 585,476,000 $ (7,794,000) $ 1,047,573,000